Photo from the night of the police-involved shooting in which two people were killed.

CLEVELAND -- Cleveland Police Chief Michael McGrath says he's hopeful a review of the fatal police-involved shootings on Nov. 29 will be complete by the end of January.

Their goal is to determine if the 13 officers involved in the incident acted in accordance with policies when they used deadly force against 43-year-old Timothy Russell and 30-year-old Malissa Williams. The two were killed when officers fired 137 total rounds at the vehicle they were in following a pursuit that lasted more than 20 minutes.

A national organization called the Police Executive Research Forum (PERF) reviewed Cleveland Police policies about the use of deadly force. According the Chief McGrath, the agency determined that Cleveland police policies are "sound and comprehensive."

Mayor Frank Jackson says if the officers are found to have acted "outside parameters that we have set, then there will be consequences." Those consequences were not defined.

If the review determines the use of deadly force was within the parameters, "we will support them and they will be protected."

Jackson also says he wants the investigation to remain transparent because it's important to keep the trust of the public, officers and the police department.

City leaders did not release information about gun residue tests. Those tests could determine if either of the suspects fired a weapon. They also did not comment on any details of the investigation. Police have said that no gun nor shell casings were found in the suspect vehicle.